Seal for pump structures



Feb. 1, 1938. s. c. BLISS S EAL FOR PUMP STRUCTURES Filed April 5, 19366254210000 6. Buss;

Patented Feb. 1, 193a 2,106,884

UNITED STATES PATENT OFFICE SEAL FOR PUMP S[IIIHJ'IJ'IURESv Sherwood C.Bliss, Buffalo, N. Y., assignor to Houde Engineering Corporation,Buffalo, N. Y., a corporation of New York Application April 3, 1936,Serial No. 72,483

2 Claims. (01. 286- 7) My invention relates to pump structures andlindrical and has the cylindrical cavity 21 which particularly toimproved construction and arregisters with the cavity 28 in the hub 29of the rangement in a pump especially adaptable for pulley member P.Screws 3!! engage with the circulating the cooling medium, such aswater, pulley members outside of their hub portions to 5 for internalcombustion engines. secure these members rigidly together and to 5 Animportant object of the invention is to proclamp in the hub recesses theouter ring 3| of vide improved bearing support for the drive shaft aball bearing structure whose inner ring is for theimpeller member whichcreates the coolformed by the projecting end ll of the sleeve ing fluidcirculation, and improved bearing sup- H, the bearing balls 32 beinginterposed beport for the pulley structure by which the shaft tween thering and the sleeve end. The hub 10 is driven.. 29 of the pulley memberP receives the shaft 24,

A further object is to provide improved packthe arrangement being suchas to maintain clearing and sealing arrangement for preventing leakance33 between the inner side of the hub 26 of age of the cooling fluid tothe various bearings the pulley member P and the adjacent end of and toprevent leakage of bearing lubricant into the boss I5. Laterallyextending annular flanges 15 the cooling fluid. on the pulley membersprovide respectively the The above enumerated and other features of beltgrooves 34 and 35. the invention are incorporated in the structure Atits outer end the hub 29 of the pulley P disclosed on the drawing, inwhich drawing: has the' cylindrical boss 36 provided with a di- 2 Figure1 is a vertical diametral section through ametrally extending andaxially elongated slot 31 2 the pump structure; for receiving the end ofa drive pin 38 extending Figure 2 is a sectional view on plane IIII ofthrough the shaft, the pulley structure being thus Figure 1; and securedto the shaft for rotary driving thereof Figure 3 is a plan view of thepacking retainand being journaled by the ball bearings on the ing ring.outer end H of the sleeve l1, there being a slight 25 Referring to thedrawing, the pump frame Ill clearance between the hub 26 of the pulley Pand provides the cylindrical pump chamber H for the sleeve. the rotor orimpeller structure [2, the frame hav- The space 39 between the sleevesupporting ing a flange l3 by which it may be secured to' flanges l6 andI6 forms a reservoir for luconnect the inlet end of the chamber II withbricant such as oil or grease. Through ports 40 30 the cylinder head ofan engine (not shown), the and the space M tw n he bearing hin framehaving the dischargeduct M for discharge 23 and 23', the lubricant findsits way for luof the cooling fluid from the chamber ll. brication of thebearing su faces of the bushings The pump frame [0 has a laterallyextending and the shaft. Lubricant is also applied in the boss l5providing inner and outer annular inspace 62 in the pulley hub 29 andbetween the 35 ternal flanges l6 and I6 respectively which supballbearing rings for lubricating the bearing. port a sleeve I! havingfriction fit therewith to To prevent le k e to the ext ri r alon he o tr be held against rotation. A screw l8 has face of the sleeve end I'I'suitable packing mathreaded engagement in the passage l9 through teriely be pp AS Shown a gasket 0 the upper part of the boss, the reducedlower packing material 42 Surrounds the Sleeve and is 40 end 20 of thescrew projecting into the annular comp between the inner Wall Of the hubgroove 2| in the sleeve I I so as to prevent lon- 26 and an abutment rin43 Which u s a ou gitudinal displacement of the sleeve, a lock der 44 onthe outer bearing ring 3|. Packing washer 22 being preferably interposedbetween material 45 may a be interposed b twe n the 45 the screw headand the boss. abutment ring and the balls to be in engagement 45 Thesleeve ll extends a distance outwardly ith the sleeve 11 and the outerbearing i 3|. from the outer supporting flange l6 and along On its innerside the'body of the rotor member its inner and 'its outer portion thesleeve I1 is 12 has a recess or pocket 46 surrounding the lined bybearing bushings 23 and 23' for the shaft. In the inner portion of thispocket packshaft 24. At its inner end the shaft is rigidly ng material47 is applied which Packing ma- 50 secured to the rotor or impeller 12which has terial may be rubber or other suitable material the impellervanes 25 extending therefrom. having elastic properties. Within therecess 46 I have shown a double pulley structure comin front of thepacking material is a retainer ring prising the pulley members P and P'.The hub 48 which is preferably flat and of suitable sheet 65 26 of thepulley member P is substantially cymetal. The retainer ring is freelymovable axial- 7 ly in the recess 46 and has radial projections 49thereon for engaging in axially extending slots in the rotor wallsurrounding the recess 46 so that the ring will rotate with the rotorand with the shaft.

The pump frame II has a boss 5| extending therefrom into the innerendofthe recess 48 .and between the inner end of this boss and theretainer ring 44 is interposed a washer 52 which may be of fiber, phenolcondensation product, or other suitable material or composition. Thiswasher surrounds the shaft but the diameter of its opening is slightlygreater than the shaft diameter so that it will be free to rotate or .tofloat between the retainer ring 48 and the adjacent end of the boss 5|.

Surrounding the cylindrical boss 35 and the drive pin 38 is a sheetmetal ring 53 whose outer end is distended to provide a bearing cup 54for a spring 55 which surrounds the shaft 24 and abuts a wall 55surrounding the shaft and which rests against a pin 51 extending throughthe shaft end. The spring is under compression and" as the ring 53 abutsagainst the hub 29 of the pulley member P the spring will tend to pullthe shaft outwardly to move the bottom of the recess .45 in the rotortoward the end of the boss 5i, the result being that the packingmaterial 41 is put under compression which acts through the retainerring 48 against the washer 52 to securely hold the washer against theadjacent end of the boss II. Preferably the inner diameter of "theretainer ring 48 is such that some of the packing "material 41 mayextend therethrough into engagement with the washer 52. The pressureagainst the packing material forces it into snug engagement with thewalls of the recess 46 and with the shaft and also into snug engagementwith the retainer ring and the washer, and as the washer is heldintimately against the end of the boss II a simple and efficient seal isprovided tending to prevent escape of the cooling fluid along the shaftor between the washer and the adjacent end of the boss engaged thereby.Owing to the resiliency and elasticity of the packing 41 the pressurewill be uniformly transmitted and the washer will accommodate itself tothe plane of the boss surface engaged thereby.

The boss 5| is hollow to provide a collecting chamber 50 around theshaft so that if any'cool-' ing fluid should by chance escape past thepacking in the rotor it will be intercepted by the chamber 58 anddischarged through the outlet 59 to the exterior of the pump structure.Any surplus lubricant which may flnd its way past the bushing 23 willalso be intercepted by the chamber 58 and discharged through the outlet59 and so will be prevented from reaching the pump chamber; I i

The abutment wall 56 for the spring 55 may have a circumferential flange50 extending inwardly therefrom to surround the spring sup- I portingring 53 so as to make a self-contained unit of the spring assembly andto prevent dust, dirt or other foreign material from finding its way tothe shaft bearing.

Should the rotation of the pump rotor be impeded, as for example byfreezing of the cooling medium, the pulley and belt structure will beprotected against injury by shearing of the drive pin 38. By pulling outthe end pin 51 and with-v drawing the spring supporting assembly, the

broken drive pin may be readily removed and a;

new pin inserted.

I thus provide a pumping structure which comprises few and simple partswhich may be economically manufactured and assembled and efllcientembodiment of the various features of my invention I do not desire tobe'limited to the exact construction, arrangement and operation in whichsimple packing means will reduce to a shown and described as changes andmodiflcations may be made without departing from the scope of theinvention.

I claim as my invention: 7

1. In a pump structure of the class described comprising aframeproviding a pump chamber and a bearing boss, a shaft structure extendingthrough and journaled insaidbos, and a pump rotor within said pumpchamber secured to the inner end of said shaft andhaving a recesssurrounding said shaft, sealing structure comprising resilient packingmaterial within the inner portionof said recess, a non-metallic sealingwasher surrounding said shaft between said packing material. and theadjacent end of said boss, a thin sheet metal retaining washer betweensaid packing material and said sealing washer, said retaining washerbeing free for axial. movement in said recess but having interlockingconnections with-said rotor for rotation therewith, said retainingwasher being of large internal diameter so asto be inintimate engagementwith only the peripheral portions of said packing material and thesealing washer, said sealing washer being of slightly larger internaldiameter than said shaft so as to,be free to rotate relative to theshaft, and spring means arranged to cause the inner end of said shaftand having a recess surrounding said shaft, sealing structure comprisingresilient packing material within the inner portion of said recess, athin sheet metal retaining washer in said recess in front of saidpacking material for maintaining said packing material aligned in saidrecess, said packing material having an annular peripheral recess in itsfront side for receiving said retaining washer, said retaining washerbeing free for axial movement in said recess but having interlockingconnection with said rotor for rotation therewith, a non-metallicsealing washer between said packing material and the adjacent end ofsaid boss, said sealing washer being free to rotate relative to saidshaft, and spring means arranged to cause the exertion of pressureagainst said packing material for compression thereof within said recessand around said shaft and for engagement thereof with the sealing washerto hold said washerintimately against said bearing boss.

sHERwoon c. Buss.

